Internal grinding fixture



Oct. 20, 1959 M. A. HOLLENGREEN.

INTERNAL GRINDING FIXTURE Filed Sept. 6, 1956 3 Sheets-Sheet 1 INVENTORM/LBURN A. HULLE/VGFfE/V ATTORNEY Oct. 20, 1959 Filed Sept. 6, 1956 3Sheets-Sheet 2 INVENTOR MILBURN AJMLLENGREEN TTORNEY Oct. 20; 1959 M. A.HOLLENGREEN 2,909,013

INTERNAL GR'INDING FIXTURE v Filed Sept. 6, 1956 5 Sheets-Sheet s r q lI I J L 'w F .1 INVENTOR I MILBUEN A-HflLLE/VEREEN ATTORNEY UnitedStates Patent INTERNAL GRINDING FIXTURE Milburn Alfred Hollengreen,Waynesb'oro, Pa., assignor to Landis Tool Company, Waynesboro, Pa.

Application September 6,1956, Serial No. 608,330

Claims. (Cl. 51-166) This invention relates to internal grindingfixtures for cylindrical grinding machines particularly to the means formounting such fixtures on the machines.

Conventional internal fixtures generally consist of a belt drivenspindle carried on a bracket which is pivotally attached to the wheelsupport on the machine.

The spindle is generally driven by belts from the jack shaft on thebracket. The jack shaft may be driven from the motor which also drivesthe external grinding wheel.

Other fixtures included a self containing fixture having a driving motorconnected by belts to the internal spindle. The spindle and motor aresupported on a bracket pivotally mounted to be swung down over thegrinding Wheel.

The present invention has a novel feature apart from that of theprevious fixtures in that, the bracket which carries the spindle anddriving motor is also the wheel fender.

It is an object of this invention to provide a rotatable mount for saidwheel fender so that the internal fixtures may be rocked toward and awayfrom operative position.

Another object is to provide an internal grinding fixture mounted toswing to and from working position about the axis of the externalgrinding wheel.

Figure 1 is an end elevation showing the internal fixture in operativeposition.

Figure 2 is an end elevation showing the internal fixture inin-operative position.

Figure 3 is a front elevation partly in section showing the sleeve whichprovides the rotatable support for the internal fixture.

Numeral indicates a wheel support for a conventional universal externalgrinding machine. 11 is a sleeve rotatably mounted in said support 10and having a flange member 12 at one end thereof. Bearings 13 aremounted in axially spaced relation in said sleeve 11. A spindle 14 isrotatably mounted in said bearings 13 and has an external grinding wheel15 mounted at one end thereof. The internal grinding fixture consists ofa bracket 16 attached to said flange member 12 and formed to serve as apart of the peripheral portion of a wheel fender. A side member 17 ofthe wheel fender is removably attached to bracket 16. At the right endof said bracket is formed a spindle housing 18 in which is rotatablymounted a spindle 19. An internal grinding wheel 20 is mounted on saidspindle 19. On the end of said spindle 19 opposite the grinding Wheel isa pulley 24 driven through belt 23 from pulley 22 on motor 21. Saidmotor 21 is adjustably and removably mounted on bracket 16.

An adjustable stop member 30 is mounted in a vertical position on thefront end of wheel support 10 adjacent 2,909,013 Patented Oct. 20, 1959bracket 16. A stop member 31 is secured in a predetermined position onbracket 16 so as to properly locate the fixture in operative positionagainst stop member 30 or in in-operative position against the top ofwheel support 10 as shown in Figure 2.. Stop member 30 is adjusted tolocate the fixture with the axes of both wheels in the same horizontalplane so that said wheels engage the workpiece in the same horizontalplane. The fixture may be clamped in either position by means of aclamping ring 35 threaded to one end of sleeve 11. A handle 36 serves asa means to actuate said clamping ring.

I claim:

1. In a grinding machine, a grinding wheel support, a grinding wheelrotatably mounted thereon, a wheel guard mounted for angular adjustmenton said wheel support and an internal grinding attachment mounted onsaid wheel guard and movable therewith in a circular path toward andfrom operative position.

2. In a grinding machine, a wheel support, a grinding wheel rotatablymounted thereon, a guard for said grinding wheel, an internal grindingattachment mounted on said guard, said guard being adjustably mounted onsaid wheel support to move said attachment toward and from operativeposition.

3. In a grinding machine, a grinding wheel support, means for rotatablysupporting a grinding wheel thereon including a sleeve rotatably mountedin said support, axially spaced hearings in said sleeve, a spindlerotatably mounted in said bearings, a grinding wheel mounted on saidspindle, a bracket on the end of said sleeve adjacent said grindingwheel and rotatable with said sleeve in the plane of said grindingwheel, an internal grinding wheel spindle rotatably mounted in saidbracket, and means also on said bracket for driving said internalgrinding wheel spindle.

4. In a grinding machine, a grinding wheel support, means for rotatablysupporting a grinding wheel thereon including a pair of axially spacedbearings, 21 spindle rotatably mounted in said bearings, a grindingwheel mounted :on said spindle, an internal grinding fixture for saidmachine having a mounting bracket pivotally mounted on said grindingWheel support, said mounting consisting of a sleeve rotatably mounted insaid support concentric with said spindle and bearings, a flange on oneend of said sleeve, said bracket being secured to said flange.

5. In a grinding machine, a grinding wheel support, means for rotatablysupporting a grinding wheel thereon including a pair of axially spacedbearings, a spindle rotatably mounted in said bearings, a grinding wheelmounted on said spindle, an internal grinding fixture for said machinehaving a mounting bracket pivotally mounted on said grinding wheelsupport, said mounting consisting of a sleeve rotatably mounted in saidsupport concentric with said spindle and bearings, a flange on one endof said sleeve, said bracket being secured to said flange, and means forlocking said fixture in either operative or in-operative positionincluding a clamping device on said sleeve.

References Cited in the file of this patent UNITED STATES PATENTS

